Ordered the large in these as that's what the fitting chart told me to do and I wear large in everything else I own.....They were uncomfortably small, my thighs looked like over stuffed sausages and I couldn't even imagine going for a ride with them! I returned them but the XL were out of stock. I couldn't find the XL anywhere EXCEPT directly from Kitsbow. I ordered them and they fit perfect. They are incredibly comfortable, the chamois offers great padding but doesn't feel like you're wearing a diaper when and after you ride. The ventilation is nice, hard to say if they are actually cooler than other shorts, maybe the vent in the back is the most noticeable.
Overall worth the money but do consider that they run a full size (at least for me) small.